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Activities of auxin polar transport in inflorescence axes of flower mutants of Arabidopsis thaliana: Relevance to flower formation and growth



Activities of auxin polar transport in inflorescence axes of flower mutants of Arabidopsis thaliana: Relevance to flower formation and growth



Journal of Plant Research 111(1103): 407-410, Sept



Relationships between the activity of auxin polar transport and flower formation were studied using several flower mutants of Arabidopsis thaliana. The activity of auxin polar transport in the upper portion of inflorescence axis of wild-type plants of Arabidopsis thaliana was significantly lower than that of the basal part. The activities of auxin polar transport in the upper portion of inflorescence axes of ap1 and clv1 mutants were significantly higher than that of wild-type plant However, those of other flower mutants tested, ap3-1, ag, pi, FI-40, R-54, FI-89 and pin-formed, were extremely low as compared with that of wild one. We got some evidence that the reduction of the activity of auxin polar transport is concerned with the growth and development of plants. We could mimic it by the removal of all flowers and pods including mature or immature seeds. Moreover, artificial pollination in ap3-1 and pi mutants, in which no seeds are found naturally, resulted in the partial recovery of the activity of auxin polar transport in inflorescence axis. Considering these results in this study together with the fact that inhibitors of auxin polar transport generated almost same disruptions of pin-formed or pinoid mutants which normally had no flowers in inflorescence axis (Okada et al. 1991, Ueda et al. 1992, Bennett et al. 1995), the system of auxin polar transport and its activity in inflorescence axis seems to be essential for the development of flower bud in early stage of Arabidopsis thaliana, and the activity of auxin polar transport is also regulated by the formation of flowers and seeds in inflorescence axis.

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Accession: 010123120

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